JP2004226549A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a manufacturing yield by adopting a structure in which short circuit between transparent electrodes is repaired without adversely affecting a thin film transistor or any other component layer. <P>SOLUTION: A metal heat dissipation member is disposed on the lower layer of the transparent electrode so as to be superposed thereon via an insulation film. A protruding part is attached to the heat dissipation member on a part more distant from the thin film transistor and the heat dissipation member is superposed on the transparent electrode at the protruding part. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid crystal display device, and more particularly, to an active matrix type liquid crystal display device in which pixel forming electrode pairs formed of thin or striped transparent electrodes are juxtaposed in a pixel region on an insulating substrate.
[0002]
[Prior art]
As a flat panel type liquid crystal display device realizing high image quality, a so-called horizontal electric field type liquid crystal display device is known. In this type of liquid crystal display device, pixel circuits having active elements such as thin film transistors (hereinafter, referred to as thin film transistors) are arranged in a matrix on an insulating substrate (first insulating substrate) such as glass. A transparent first transparent electrode (pixel electrode) driven by the thin film transistor via an insulating layer, and a thin linear electrode adjacent to the first transparent electrode. And a transparent second transparent electrode (common electrode) are formed on the same insulating substrate, and an electric field substantially parallel to the surface of the insulating substrate is formed between the first and second transparent electrodes in the pixel region. To control the orientation of the liquid crystal to display an image. Each of the transparent electrodes is made of a transparent conductive film such as ITO. Note that the first insulating substrate is bonded to a second insulating substrate that is preferably made of glass (not shown), and liquid crystal is sealed between the two insulating substrates.
[0003]
[Patent Document 1]
Japanese Patent No. 3170446 [0004]
[Problems to be solved by the invention]
In a liquid crystal display device having a pixel structure in which a pixel is turned on by such a pair of transparent electrodes, an electrode for forming each of the transparent electrodes between the adjacent first and second transparent electrodes (pixel electrode and common electrode) is used. If a short circuit occurs due to the residue, the pixel becomes a point defect and the display function is lost. In order to remove and repair such a short circuit, it is conceivable to irradiate the short circuit with a laser to cut and separate the first and second transparent electrodes. When a short circuit in a transparent electrode is repaired by laser irradiation, rapid cutting is often not achieved because the transparent electrode has a low absorption efficiency of the irradiated laser. When trying to cut by increasing the intensity of the laser, the temperature around the laser-irradiated part also becomes high, and not only the region originally intended to be cut, but also the underlying insulating film including the peripheral portion evaporates, and the desired repair is performed. I can't.
[0005]
11A and 11B are schematic diagrams illustrating a short-circuit state between the transparent electrodes. FIG. 11A is a plan view, and FIG. 11B is a cross-sectional view along the line DD ′ in FIG. FIG. 12 is a schematic diagram for explaining a repair operation of a short-circuit portion between transparent electrodes. FIG. 12A is a plan view, and FIG. 12B is along a line EE ′ in FIG. FIG. As shown in FIG. 11, the pixel electrode PX, which is the first transparent electrode adjacent to the pixel electrode, and the common electrode CT, which is the second transparent electrode adjacent to the pixel electrode PX, are short-circuited at the short-circuit portion XPD due to electrode residue or the like. In this case, when the laser L is irradiated with an intensity that separates the short-circuit portion XPD from the insulating substrate SUB side as shown in FIG. 12, the short-circuit portion XPD evaporates together with the insulating film PAS, and the pixel electrode PX and the common electrode CT The pixel having the pixel electrode PX and the common electrode CT loses the pixel function and becomes a point defect.
[0006]
Further, for example, a liquid crystal display device in which a transparent electrode is formed on a metal film via an insulating film up to a thin film transistor portion as an active element, that is, an electrode structure as disclosed in Patent Document 1, for example, is known. . When a repair operation was performed on a liquid crystal display device having such a pixel structure by laser irradiation in the same manner as described above, the metal film was opaque to the laser. However, it was found that the heat from the laser irradiation was transmitted through the metal film to the thin film transistor, the semiconductor film forming the thin film transistor was altered, and the characteristics were different from those of the other thin film transistors, resulting in a point defect. . This has been one of the issues to be solved in the restoration work.
[0007]
The present invention has been made in view of the above-described problems in the related art, and has as its object to provide a liquid crystal in which a pair of thin transparent electrodes are juxtaposed adjacent to the same insulating substrate as electrodes for lighting pixels. To improve the yield of product production by repairing short circuits between transparent electrodes in display devices without affecting active elements such as thin film transistors, and without evaporating other constituent layers or invading liquid crystals. is there.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a liquid crystal display device according to the present invention includes a plurality of thin film transistors, a large number of scanning signal lines, a large number of data signal lines intersecting with the scanning signal lines, a pixel region on an insulating substrate. A first transparent electrode which is arranged in parallel in a pixel region surrounded by a common signal line, a scanning signal line and a data signal line and which is a pixel electrode connected to an output electrode of a thin film transistor; The second transparent electrode which is formed adjacent to the first transparent electrode and which is to be the opposite electrode, is overlapped with the first transparent electrode and the lower layer of the second transparent electrode via an insulating film, and is the same as the first transparent electrode. A metal film to which a potential is applied.
[0009]
Then, a wide portion extending along the extending direction of the scanning signal line and a projecting portion projecting in the extending direction of the data signal line with a width smaller than the width of the wide portion are formed on the metal film. Are provided with portions overlapping with the first transparent electrode and the second transparent electrode, respectively, and the width of the overlapping portion is wider than the widths of the first transparent electrode and the second transparent electrode.
[0010]
The projecting portion of the metal film has a smaller heat capacity because the projecting area is smaller than that of the metal film. When repairing a short circuit between the first transparent electrode and the second transparent electrode, the protruding portion is irradiated with a low-energy laser from the insulating substrate side to evaporate the short-circuit portion for each metal film and cut and separate it. Further, by forming the protruding portion on the side far from the thin film transistor, heat generated in the protruding portion by laser irradiation is diffused in the wide portion, and the heat transmitted to the thin film transistor is greatly reduced, so that the characteristics of the thin film transistor are improved. Deterioration due to heat can be avoided.
[0011]
Further, according to the present invention, an isolated metal film wider than the width of the transparent electrode is provided so as to overlap with the first and second transparent electrodes. When the short circuit between the first transparent electrode and the second transparent electrode is repaired, the transparent electrode can be cut and separated at the metal film portion by the same laser irradiation as described above. In this case, similarly, the heat generated in the metal film by the laser irradiation is diffused in the wide isolated metal film, and the heat transmitted to the thin film transistor is significantly reduced, so that the deterioration of the characteristics of the thin film transistor due to the heat can be avoided.
[0012]
Also, the present invention provides a common signal line having a projection overlapping with the first transparent electrode and wider than the width of the first transparent electrode to repair a short circuit between the first transparent electrode and the second transparent electrode. In this case, the transparent electrode can be cut and separated at the metal film portion by the same laser irradiation as described above. In this case, similarly, the heat generated in the metal film by the laser irradiation is diffused in the wide isolated metal film, and the heat transmitted to the thin film transistor is significantly reduced, so that the deterioration of the characteristics of the thin film transistor due to the heat can be avoided.
[0013]
A further example of the invention will now be described.
(1) One of a pair of substrates opposed to each other via a liquid crystal,
A thin film transistor, a scan signal line, a data signal line disposed to intersect the scan signal line, a pixel electrode connected to an output electrode of the thin film transistor, and an electric field formed between the pixel electrode and the pixel electrode. In a liquid crystal display device having a common electrode,
In a pixel region surrounded by an adjacent scanning signal line and an adjacent data signal line, a metal heat diffusion member provided apart from the thin film transistor,
The heat diffusion member has a protrusion at a portion farther than the distance between the thin film transistor and the heat diffusion member,
The protruding portion, at least one of the pixel electrode and the common electrode has an overlapping portion, and in the overlapping portion, one of the pixel electrode and the common electrode overlapping the protruding portion is a transparent electrode. It is characterized by.
[0014]
(2) In the constitution (1), the width of the protruding portion is equal to or larger than the width of the pixel electrode or the common electrode at a portion overlapping with the protruding portion.
[0015]
(3) In the constitution (2), the pixel electrode is a transparent electrode, and the heat diffusion member and the pixel electrode overlap with each other at the projecting portion.
[0016]
(4) In the constitution (3), the heat diffusion member is in the same layer as the output electrode of the thin film transistor, and the heat diffusion member and the pixel electrode are connected by a through hole on the heat diffusion member. I do.
[0017]
(5) In the constitution (4), a common signal line is provided, and the heat diffusion member is superimposed on the common signal line, and a protrusion of the heat diffusion member protrudes from the common signal line.
[0018]
(6) In the constitution (3), the heat diffusion member also serves as a common signal line.
[0019]
(7) In the constitution (2), the common electrode is a transparent electrode, and the heat diffusion member and the common electrode overlap with each other at the projecting portion.
[0020]
(8) In the constitution (7), a common signal line is provided, and the common signal line also serves as the heat diffusion member.
[0021]
(9) One of the pair of substrates opposed to each other with the liquid crystal interposed therebetween,
A thin film transistor, a scan signal line, a data signal line disposed to intersect the scan signal line, a pixel electrode connected to an output electrode of the thin film transistor, and an electric field formed between the pixel electrode and the pixel electrode. In a liquid crystal display device having a common electrode,
In a pixel region surrounded by an adjacent scanning signal line and an adjacent data signal line, a metal heat diffusion member provided apart from the thin film transistor,
The heat diffusion member is disposed in isolation and has a portion overlapping at least one of the pixel electrode and the common electrode.
[0022]
(10) In the constitution (9), at least one of the overlapping pixel electrode and the common electrode is a transparent electrode.
[0023]
(11) In any one of the constitutions (1) to (10), an inorganic insulating film and an organic insulating film may be formed between the layer on which the heat diffusion member is formed and the layer on which the electrode overlapping the heat diffusion member is formed. Wherein the organic insulating film has a removed portion in at least a part of an overlapping portion of the heat diffusion member and the electrode.
[0024]
The other features of the present invention will become apparent from the description of the embodiments below. However, the present invention is not limited to these configurations, and various changes may be made without departing from the technical idea of the present invention. Needless to say, this is possible.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIGS. 1A and 1B are block diagrams showing the vicinity of one pixel for explaining a first embodiment of a liquid crystal display device according to the present invention. FIG. 1A is a plan view, and FIG. FIG. In FIG. 1, a plurality of thin film transistors TFT are arranged in a matrix on an insulating substrate SUB1 made of glass. A large number of scanning signal lines GL are formed which extend in a first direction (hereinafter referred to as x direction) on the insulating substrate SUB1 and apply a selection signal to the thin film transistor in a second direction (hereinafter referred to as y direction) crossing the x direction. ing. Also, a number of data signal lines DL are formed extending in the y direction and formed in the x direction and supplying data signals to the thin film transistors TFT. Further, a common signal line CL extending in the x direction is formed in a pixel region surrounded by the scanning signal lines GL and the data signal lines DL.
[0026]
In a pixel region surrounded by the scanning signal line GL and the data signal line DL, a first transparent electrode (hereinafter, pixel electrode) PX connected to an output electrode (here, a source electrode) of the thin film transistor TFT and a common signal line CL are provided. A second transparent electrode (hereinafter, a common electrode) CT which is connected to be a counter electrode of the pixel electrode PX is provided in parallel. The common signal line CL connected to the common electrode CT is provided in the pixel area.
[0027]
Under the pixel electrode PX, there is a metal film PXM that is superimposed via the insulating films PAS1 and PAS2 and applied with the same potential as the pixel electrode PX. The metal film PXM is disposed above the common signal line CL, and has a wide portion PXMW extending along the direction in which the scanning signal line GL extends, and an extension of the data signal line DL having a width smaller than the width of the wide portion PXMW. The protrusion PXMP protrudes in the direction. The projecting portion PXMP overlaps the pixel electrode PX, and the width at the overlapping portion is wider than the pixel electrode PX. The plurality (two in this case) of pixel electrodes PX are mutually connected by a metal film PXM through through holes penetrating the insulating films PAS1 and PAS2.
[0028]
When the width of the pixel electrode PX (common electrode CT) is 10 μm, it is preferable that the protrusion length of the protrusion PXMP is 20 μm or less, and the width is 20 μm or less. This is because PXMP causes a decrease in aperture ratio.
[0029]
In FIG. 1, the thin film transistor TFT includes a drain electrode SD1 extending from a data signal line DL, a source electrode SD2 as an output electrode, and a semiconductor film (for example, a-Si). The source electrode SD2 is connected to a pixel electrode PX. I have. Note that the gate electrode of the thin film transistor TFT is a scanning signal line GL, and the data signal line DL and the metal film PXM are formed over the gate insulating layer GI. The pixel electrode PX is connected to the metal film PXM through the through holes TH1 and TH2. The insulating substrate SUB1 is usually called a thin film transistor substrate, and a color filter substrate (SUB2), which is a second substrate (not shown), is arranged on the insulating substrate SUB1, and a liquid crystal layer is sealed between the two substrates.
[0030]
FIG. 2 to FIG. 4 are explanatory diagrams of the repair procedure of the short circuit in the first embodiment of the present invention. Here, as shown in FIG. 2, the pixel electrode PX connected to the source electrode SD2 of the thin film transistor and extending directly to the pixel region and the common electrode CT adjacent to the pixel electrode PX form the pixel electrode and the common electrode. It is assumed that the electrode residue causes a short circuit at the short circuit portion XDP. In order to repair this short circuit, the laser is irradiated to the laser irradiation position LRP of the protrusion PXMP of the metal film PXM indicated by “x” in FIG. The laser irradiation position LRP is farther from the thin film transistor TFT with respect to the metal film PXM. The energy of this laser is such that the lower insulating film does not evaporate, and the pixel electrode PX superimposed on the metal film PXM via the insulating films PAS1 and PAS2 (see FIG. 1) is evaporated together with the metal film PXM. Then, the pixel electrode PX is separated from the common electrode CT. FIG. 4 shows the state after cutting and separation.
[0031]
Due to the above-mentioned repair work, a part of the pixel (a part composed of the separated pixel electrode PX and the common electrode CT with the short-circuit part XDP hung) does not contribute to the display, but the pixel as a whole becomes Lighting / extinguishing becomes possible, and a pixel having a lighting / extinguishing function as an original pixel is recovered from a point defect in which the entire pixel is neither turned on nor turned off.
[0032]
Further, when the pixel electrode PX connected to the metal film PXM through the through hole TH2 and the common electrode CT at the center of the drawing are short-circuited at the short-circuit portion XDPA, the laser irradiation position LRPA is used. When the pixel electrode PX connected to the metal film PXM at the through hole TH2 and the common electrode CT at the right end of the drawing are short-circuited at the short-circuit portion XDPB, the pixel electrode PX is separated at the laser irradiation position LRPB. Restoration is performed as described above.
[0033]
FIG. 5 is a configuration diagram around one pixel for explaining a second embodiment of the liquid crystal display device according to the present invention. In the liquid crystal display device of the present embodiment, the common electrode CT at the center of the pixel has a configuration independent of the common electrodes on both left and right ends, and is connected by a through hole TH3 at a protruding portion formed on the common signal line CL. Have been. Even in the liquid crystal display device having this structure, the repair when a short circuit is present at the same position as in FIG. 3 can be similarly performed. When there is a short-circuited part XDPC or a short-circuited part XDPD at the position shown in FIG. 5, the central common electrode CT is separated at the laser irradiation position LRPC, and the right pixel electrode PX is separated at the laser irradiation position LRPC. Restoration is possible. Further, even when a short circuit occurs at a position other than that shown in the figure, the laser irradiation is performed at the position of the protrusion of the metal film PXM or the protrusion formed on the common signal line CL, thereby using a laser having a weak energy. Repairs can be made. Also, by combining the repair procedure of FIGS. 1 to 4 and the repair procedure of FIG. 5, one or more short circuits can be repaired.
[0034]
FIG. 6 is a schematic plan view illustrating another configuration example of the connection form between the common electrode and the common signal line. In this configuration, the common electrode CT formed on the insulating substrate SUB1 is connected to the connecting portion JTL located in the bonding region between the insulating substrate SUB1 and the other insulating substrate (color filter substrate) SUB2 outside the display region AR. Configuration. Therefore, the manufacturing process can be simplified without the need for a through hole processing step.
[0035]
7A and 7B are main part schematic diagrams illustrating another configuration example when a short circuit is repaired at the overlapping portion of the transparent electrode and the protruding portion of the metal film. FIG. 7A is a plan view, and FIG. FIG. 8 shows a cross-sectional view along the line BB ′ of FIG. In this configuration example, a stacked film of an inorganic insulating film PAS1 and an organic insulating film PAS2 is provided between the pixel electrode PX and the metal film PXM. In the organic insulating film PAS2, a removed portion HOL is provided in at least a part of a portion where the protrusion WP overlaps the pixel electrode PX. In the figure, reference numeral SUB1 is a first insulating substrate, and GI is a gate insulating film.
[0036]
The organic insulating film PAS2 has a larger volume expansion coefficient due to heat than the inorganic insulating film PAS1. Therefore, the organic insulating film PAS2 expands and scatters when repairing the short-circuit portion by laser irradiation, and a part of the organic insulating film PAS2 penetrates into the liquid crystal, thereby deteriorating the characteristics of the liquid crystal. In order to prevent this, a removal portion HOL is provided in a part of the organic insulating film PAS2 at a portion where the projecting portion WP overlaps the pixel electrode PX, so that the organic insulating film PAS2 at the time of repair in which the short-circuit portion is evaporated by laser irradiation. Is reduced by the presence of the removal portion HOL. As a result, invasion of the organic insulating film PAS2 into the liquid crystal can be avoided. The shape and number of the removal portions HOL are not limited to those illustrated. The same applies to the case where the transparent electrode is the common electrode CT. The effect is further improved by making the width of the removed portion larger than the width of the electrode.
[0037]
FIGS. 8A and 8B are views showing the configuration around one pixel for explaining a third embodiment of the liquid crystal display device according to the present invention. FIG. 8A is a plan view, and FIG. FIG. In the figure, reference numeral IM is an isolated metal film, and the same reference numerals as those in the above-described embodiment correspond to the same functional portions. In this embodiment, an isolated metal film IM that is not electrically connected to other electrodes via an insulating film (PAS1 or PAS2) is provided under the pixel electrode PX as the first transparent electrode. The same applies to the second transparent electrode CT which is a common electrode.
[0038]
This isolated metal film IM is formed wider than the width of the pixel electrode PX (or the common electrode CT) in the upper layer. The isolated metal film IM efficiently concentrates the heat of the laser irradiated from the first insulating substrate SUB1 on the pixel electrode PX (or the common electrode CT) when the short-circuit portion XDP is repaired. The PX (or the common electrode CT) can be cut. Therefore, it is possible to reduce the influence of the heat at the time of repair on the insulating film and other portions.
[0039]
FIG. 9 is a configuration diagram around one pixel for explaining a fourth embodiment of the liquid crystal display device according to the present invention. In the present embodiment, a protrusion CLP that overlaps the pixel electrode PX on the common signal line CL and protrudes in the direction in which the pixel electrode PX extends is formed wider than the width of the pixel electrode PX. When repairing the short-circuit portion XDP, the laser irradiation position indicated by “x” is cut by laser irradiation. Note that the source electrode SD2 of the thin film transistor is connected to the pixel electrode PX through the through hole TH1. In this configuration, the common signal line CL is formed in a portion covered with a black matrix (not shown) by moving the common signal line CL to the scanning signal line GL. However, as in the above-described embodiment, the common signal line CL is provided in the pixel region. The projecting portion CLP can be formed on the communication line CL. According to this embodiment as well, a short-circuit defect can be repaired and a liquid crystal display device free of point defects can be obtained.
[0040]
FIG. 10 is a configuration diagram around one pixel for explaining a fifth embodiment of the liquid crystal display device according to the present invention. This embodiment is a combination of the embodiment described with reference to FIG. 1 and the embodiment described with reference to FIG. 8, and a metal film PXM having a protrusion PXMP similar to that illustrated in FIG. And an isolated metal film IM similar to the above. Other configurations and effects are the same as those described with reference to FIGS.
[0041]
【The invention's effect】
As described above, according to the present invention, when a short circuit of a transparent electrode constituting a pixel electrode or a common electrode is repaired by laser irradiation, the short circuit portion can be rapidly cut, and only a region to be cut is originally intended. Can be repaired while suppressing evaporation of the underlying insulating film, and the yield can be improved.
[Brief description of the drawings]
FIG. 1 is a configuration diagram around one pixel for explaining an embodiment of a liquid crystal display device according to the present invention.
FIG. 2 is an explanatory diagram of a procedure for repairing a short circuit in an embodiment of the present invention.
FIG. 3 is an explanatory diagram of a procedure for repairing a short circuit in an embodiment of the present invention.
FIG. 4 is an explanatory diagram of a procedure for repairing a short circuit in the embodiment of the present invention.
FIG. 5 is a configuration diagram around one pixel for explaining another embodiment of the liquid crystal display device according to the present invention.
FIG. 6 is a schematic plan view illustrating another configuration example of a connection mode between a common electrode and a common signal line.
FIG. 7 is a main part schematic diagram for explaining another configuration example in the case where a short circuit is repaired at an overlapping portion of a transparent electrode and a protruding portion of a metal film.
FIG. 8 is a configuration diagram around one pixel for explaining another embodiment of the liquid crystal display device according to the present invention.
FIG. 9 is a configuration diagram around one pixel for explaining another embodiment of the liquid crystal display device according to the present invention.
FIG. 10 is a configuration diagram around one pixel for explaining another embodiment of the liquid crystal display device according to the present invention.
FIG. 11 is a schematic diagram illustrating a short-circuit state between transparent electrodes.
FIG. 12 is a schematic diagram illustrating a repair operation of a short-circuit portion between transparent electrodes.
[Explanation of symbols]
SUB1... Insulating substrate (first insulating substrate), SUB2... Insulating substrate (second insulating substrate, GL... Scanning signal line, DL... Data signal line, PX. ..Pixel electrode, CT common electrode, CL common signal line, PAS1, PAS2 insulating film, PXM metal film, PXMW wide part, PXMP ... Projection, XDPA ... Short circuit, LRPA ... Laser irradiation position.

Claims (11)

On one of a pair of substrates disposed opposite each other via a liquid crystal,
A thin film transistor, a scan signal line, a data signal line disposed to intersect the scan signal line, a pixel electrode connected to an output electrode of the thin film transistor, and an electric field formed between the pixel electrode and the pixel electrode. In a liquid crystal display device having a common electrode,
In a pixel region surrounded by an adjacent scanning signal line and an adjacent data signal line, a metal heat diffusion member provided apart from the thin film transistor,
The heat diffusion member has a protrusion at a portion farther than the distance between the thin film transistor and the heat diffusion member,
The protruding portion, at least one of the pixel electrode and the common electrode has an overlapping portion, and in the overlapping portion, one of the pixel electrode and the common electrode overlapping the protruding portion is a transparent electrode. A liquid crystal display device characterized by the above-mentioned. 2. The liquid crystal display device according to claim 1, wherein the width of the protrusion is equal to or greater than the width of the pixel electrode or the common electrode at a portion overlapping the protrusion. 3. The liquid crystal display device according to claim 2, wherein the pixel electrode is a transparent electrode, and the heat diffusion member and the pixel electrode overlap at the protrusion. 4. The liquid crystal display according to claim 3, wherein said heat diffusion member is in the same layer as an output electrode of said thin film transistor, and said heat diffusion member and said pixel electrode are connected by a through hole on said heat diffusion member. apparatus. The liquid crystal display device according to claim 4, further comprising a common signal line, wherein the heat diffusion member is superimposed on the common signal line, and a protrusion of the heat diffusion member protrudes from the common signal line. 4. The liquid crystal display device according to claim 3, wherein the heat diffusion member also serves as a common signal line. 3. The liquid crystal display device according to claim 2, wherein the common electrode is a transparent electrode, and the heat diffusion member and the common electrode overlap at the protrusion. The liquid crystal display device according to claim 7, further comprising a common signal line, wherein the common signal line also functions as the heat diffusion member. On one of a pair of substrates disposed opposite each other via a liquid crystal,
A thin film transistor, a scan signal line, a data signal line disposed to intersect the scan signal line, a pixel electrode connected to an output electrode of the thin film transistor, and an electric field formed between the pixel electrode and the pixel electrode. In a liquid crystal display device having a common electrode,
In a pixel region surrounded by an adjacent scanning signal line and an adjacent data signal line, a metal heat diffusion member provided apart from the thin film transistor,
The liquid crystal display device, wherein the heat diffusion member is disposed in an isolated manner and has an overlapping portion with at least one of the pixel electrode and the common electrode. 10. The liquid crystal display device according to claim 9, wherein at least one of the pixel electrode and the common electrode overlapping each other is a transparent electrode. The layer on which the heat diffusion member is formed, and an inorganic insulating film and an organic insulating film between a layer on which an electrode overlapping the heat diffusion member is formed, wherein the organic insulating film is formed by the heat diffusion member and the electrode. The liquid crystal display device according to any one of claims 1 to 10, further comprising a removing portion in at least a part of the superimposed portion.

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